US2011103436A1PendingUtilityA1

Transmit psd ceiling in packet-based ofdm systems

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Assignee: AWARE INCPriority: Aug 25, 2008Filed: Aug 25, 2009Published: May 5, 2011
Est. expiryAug 25, 2028(~2.1 yrs left)· nominal 20-yr term from priority
Inventors:Joon Bae KimMarcos T. TzannesPeter N. HellerStuart D. Sandberg
H04L 5/0037H04L 5/0007H04L 5/006H04L 5/0091
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Claims

Abstract

Adjusted maximum transmit PSD levels have an effect on the SNR. If the ADC noise is assumed to be the limiting factor, then there can be a benefit for reducing the maximum transmit PSD level. For example, by lowering the maximum transmit PSD level from −50 dBm/Hz to −70 dBm/Hz results in an increase in SNR for subcarriers above 30 M Hz. The SNR for subcarriers above 30 MHz can increase from 30 db (−80-(−110)) to 50 db (−80-(−130)). Therefore, by changing the maximum transmit PSD level, applying a ceiling on PSD mask, the aggregate sum of the available SNR's over the available subcarriers is therefore increasing the obtainable OFDM data rate. In other words, a maximum transmit PSD mask can be used to lower the transmit PSD value of at least one subcarrier which results in an increase in SNR for at least one subcarrier.

Claims

exact text as granted — not AI-modified
1 . In an OFDM packet-based transceiver, a method comprising:
 generating a packet comprising a header;   encoding a transmit PSD ceiling value into a bit field contained in the header of a packet; and   transmitting the packet using a plurality of subcarriers.   
     
     
         2 . In an OFDM packet-based transceiver, a method comprising:
 receiving a packet using a plurality of subcarriers;   processing a header of the packet;   decoding a bit field in the header that contains the transmit PSD ceiling value.   
     
     
         3 . (canceled) 
     
     
         4 . The method of  claim 1 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         5 . The method of  claim 1 , wherein the PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         6 .- 44 . (canceled) 
     
     
         45 . In an OFDM packet-based system, a method comprising:
 generating, in a first transceiver, a packet comprising a header;   encoding, in the first transceiver, a transmit PSD ceiling value into a bit field contained in the header of a packet;   transmitting, from the first transceiver, the packet using a plurality of subcarriers;   receiving, in a second transceiver, a packet using the plurality of subcarriers;   processing, in the second transceiver, the header of the packet; and   decoding, in the second transceiver, the bit field in the header that contains the transmit PSD ceiling value.   
     
     
         46 .- 347 . (canceled) 
     
     
         348 . The method of  claim 2 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         349 . The method of  claim 2 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         350 . The method of  claim 45 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         351 . The method of  claim 45 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         352 . An OFDM packet-based transceiver capable of generating a packet comprising a header, encoding a transmit PSD ceiling value into a bit field contained in the header of a packet, and transmitting the packet using a plurality of subcarriers. 
     
     
         353 . The transceiver of  claim 352 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         354 . The transceiver of  claim 352 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         355 . An OFDM packet-based transceiver capable of receiving a packet using a plurality of subcarriers, processing a header of the packet, and decoding a bit field in the header that contains the transmit PSD ceiling value. 
     
     
         356 . The transceiver of  claim 355 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         357 . The transceiver of  claim 355 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         358 . An OFDM packet-based system comprising:
 a first transceiver capable of generating a packet comprising a header, encoding a transmit PSD ceiling value into a bit field contained in the header of a packet and transmitting, from the first transceiver, the packet using a plurality of subcarriers;   a second transceiver capable of receiving a packet using the plurality of subcarriers, processing the header of the packet, and decoding the bit field in the header that contains the transmit PSD ceiling value.   
     
     
         359 . The system of  claim 358 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         360 . The system of  claim 358 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         361 . A non-transitory computer-readable information storage media having stored thereon instructions, that if executed by a processor, cause to be performed in an OFDM packet-based transceiver a method comprising:
 generating a packet comprising a header;   encoding a transmit PSD ceiling value into a bit field contained in the header of a packet; and   transmitting the packet using a plurality of subcarriers.   
     
     
         362 . The media of  claim 361 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         363 . The media of  claim 361 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         364 . A non-transitory computer-readable information storage media having stored thereon instructions, that if executed by a processor, cause to be performed in an OFDM packet-based transceiver a method comprising:
 receiving a packet using a plurality of subcarriers;   processing a header of the packet;   decoding a bit field in the header that contains the transmit PSD ceiling value.   
     
     
         365 . The media of  claim 364 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         366 . The media of  claim 364 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier. 
     
     
         367 . A non-transitory computer-readable information storage media having stored thereon instructions, that if executed by a processor, cause to be performed in an OFDM packet-based system a method comprising:
 generating, in a first transceiver, a packet comprising a header;   encoding, in the first transceiver, a transmit PSD ceiling value into a bit field contained in the header of a packet;   transmitting, from the first transceiver, the packet using a plurality of subcarriers;   receiving, in a second transceiver, a packet using the plurality of subcarriers;   processing, in the second transceiver, the header of the packet; and   decoding, in the second transceiver, the bit field in the header that contains the transmit PSD ceiling value.   
     
     
         368 . The media of  claim 367 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value. 
     
     
         369 . The media of  claim 367 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.

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